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MMSZ5251B

Public Made by Adom

by adom

Slkor SLKORMICRO Elec Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MMSZ5251B

Slkor SLKORMICRO Elec · Zener Diodes · SOD-123

MMSZ5251B from Slkor SLKORMICRO Elec, in a SOD-123. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Cathode passive Zener cathode terminal of the SOD-123 package; the device is rated for total power dissipation of max. 500 mW and an operating and storage range of -55 to +150 °C.
2 Anode passive Zener anode terminal of the SOD-123 package, forming the reverse-biased zener junction with the cathode; the same 500 mW and -55 to +150 °C limits apply.

Key specifications

Parameter Value
Manufacturer Slkor SLKORMICRO Elec
Package SOD-123
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Zener voltage (VZT) at IZT VZT 20.9 22 23.1 V IZT = 5.6 mA; VZT tested with pulses (20 ms) 2
Dynamic impedance at IZT ZZT 29 Ω at IZT = 5.6 mA 2
Reverse current IR 0.1 µA at VR = 17 V 2
Knee dynamic impedance ZZK 600 Ω at IZK = 0.25 mA 2
Zener voltage tolerance -5 5 % Printed as 'Tolerance approximately ±5%' (features); suffix B 1
Total power dissipation Ptot 500 mW Ta = 25℃ (table header) 1
Operating and storage temperature range Tj, Tstg -55 150 °C 1
Typical thermal resistance, junction to ambient RθJA 340 °C/W P.C.B. mounted with 2.0" X 2.0" (5 X 5 cm) copper area pads 1

CAD (KiCad official)

  • Symbol: MMSZ5251B
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5251b-etched.step / mmsz5251b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5251b.step / mmsz5251b.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Slkor SLKORMICRO Elec datasheet (3 pp, sha256 7c7f49081d6dd25f, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF